CD Minimal State Realization VI

Control Design VI and Function

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Installed With: Control Design and Simulation Module

Calculates a reduced State-Space Model based on null rows and columns in the controllability and observability matrices, respectively. Even though the controllability and observability matrices might be rank deficient, state elimination only occurs when columns or rows on such matrices are below a tolerance.

Details

Place on the block diagram

Find on the Functions palette

State-Space Model contains a mathematical representation of and information about the system of which this VI reduces the states.

Tolerance is the threshold this VI uses to determine if a row or column of the controllability or observability matrix is null. The default is 2E–16.

error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use exception control to treat what is normally an error as no error or to treat a warning as an error. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

	status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
	code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

Reduced Model returns the minimal state-space realization. To access and modify the data in the model, use the Model Information VIs.

Removed States returns the index number of the states that this VI eliminated from the original system. The index is zero-based.

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.

	status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

CD Minimal State Realization Details

This VI supports delays. Refer to the LabVIEW Control Design User Manual for more information about delays.

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